Commit | Line | Data |
---|---|---|
470decc6 | 1 | /* |
f7f4bccb | 2 | * linux/fs/jbd2/commit.c |
470decc6 DK |
3 | * |
4 | * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 | |
5 | * | |
6 | * Copyright 1998 Red Hat corp --- All Rights Reserved | |
7 | * | |
8 | * This file is part of the Linux kernel and is made available under | |
9 | * the terms of the GNU General Public License, version 2, or at your | |
10 | * option, any later version, incorporated herein by reference. | |
11 | * | |
12 | * Journal commit routines for the generic filesystem journaling code; | |
13 | * part of the ext2fs journaling system. | |
14 | */ | |
15 | ||
16 | #include <linux/time.h> | |
17 | #include <linux/fs.h> | |
f7f4bccb | 18 | #include <linux/jbd2.h> |
470decc6 DK |
19 | #include <linux/errno.h> |
20 | #include <linux/slab.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/pagemap.h> | |
8e85fb3f | 23 | #include <linux/jiffies.h> |
818d276c | 24 | #include <linux/crc32.h> |
470decc6 DK |
25 | |
26 | /* | |
27 | * Default IO end handler for temporary BJ_IO buffer_heads. | |
28 | */ | |
29 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) | |
30 | { | |
31 | BUFFER_TRACE(bh, ""); | |
32 | if (uptodate) | |
33 | set_buffer_uptodate(bh); | |
34 | else | |
35 | clear_buffer_uptodate(bh); | |
36 | unlock_buffer(bh); | |
37 | } | |
38 | ||
39 | /* | |
40 | * When an ext3-ordered file is truncated, it is possible that many pages are | |
41 | * not sucessfully freed, because they are attached to a committing transaction. | |
42 | * After the transaction commits, these pages are left on the LRU, with no | |
43 | * ->mapping, and with attached buffers. These pages are trivially reclaimable | |
44 | * by the VM, but their apparent absence upsets the VM accounting, and it makes | |
45 | * the numbers in /proc/meminfo look odd. | |
46 | * | |
47 | * So here, we have a buffer which has just come off the forget list. Look to | |
48 | * see if we can strip all buffers from the backing page. | |
49 | * | |
50 | * Called under lock_journal(), and possibly under journal_datalist_lock. The | |
51 | * caller provided us with a ref against the buffer, and we drop that here. | |
52 | */ | |
53 | static void release_buffer_page(struct buffer_head *bh) | |
54 | { | |
55 | struct page *page; | |
56 | ||
57 | if (buffer_dirty(bh)) | |
58 | goto nope; | |
59 | if (atomic_read(&bh->b_count) != 1) | |
60 | goto nope; | |
61 | page = bh->b_page; | |
62 | if (!page) | |
63 | goto nope; | |
64 | if (page->mapping) | |
65 | goto nope; | |
66 | ||
67 | /* OK, it's a truncated page */ | |
68 | if (TestSetPageLocked(page)) | |
69 | goto nope; | |
70 | ||
71 | page_cache_get(page); | |
72 | __brelse(bh); | |
73 | try_to_free_buffers(page); | |
74 | unlock_page(page); | |
75 | page_cache_release(page); | |
76 | return; | |
77 | ||
78 | nope: | |
79 | __brelse(bh); | |
80 | } | |
81 | ||
82 | /* | |
83 | * Try to acquire jbd_lock_bh_state() against the buffer, when j_list_lock is | |
84 | * held. For ranking reasons we must trylock. If we lose, schedule away and | |
85 | * return 0. j_list_lock is dropped in this case. | |
86 | */ | |
87 | static int inverted_lock(journal_t *journal, struct buffer_head *bh) | |
88 | { | |
89 | if (!jbd_trylock_bh_state(bh)) { | |
90 | spin_unlock(&journal->j_list_lock); | |
91 | schedule(); | |
92 | return 0; | |
93 | } | |
94 | return 1; | |
95 | } | |
96 | ||
818d276c GS |
97 | /* |
98 | * Done it all: now submit the commit record. We should have | |
470decc6 DK |
99 | * cleaned up our previous buffers by now, so if we are in abort |
100 | * mode we can now just skip the rest of the journal write | |
101 | * entirely. | |
102 | * | |
103 | * Returns 1 if the journal needs to be aborted or 0 on success | |
104 | */ | |
818d276c GS |
105 | static int journal_submit_commit_record(journal_t *journal, |
106 | transaction_t *commit_transaction, | |
107 | struct buffer_head **cbh, | |
108 | __u32 crc32_sum) | |
470decc6 DK |
109 | { |
110 | struct journal_head *descriptor; | |
818d276c | 111 | struct commit_header *tmp; |
470decc6 | 112 | struct buffer_head *bh; |
818d276c | 113 | int ret; |
470decc6 DK |
114 | int barrier_done = 0; |
115 | ||
116 | if (is_journal_aborted(journal)) | |
117 | return 0; | |
118 | ||
f7f4bccb | 119 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 DK |
120 | if (!descriptor) |
121 | return 1; | |
122 | ||
123 | bh = jh2bh(descriptor); | |
124 | ||
818d276c GS |
125 | tmp = (struct commit_header *)bh->b_data; |
126 | tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); | |
127 | tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK); | |
128 | tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid); | |
129 | ||
130 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
131 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
132 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; | |
133 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; | |
134 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); | |
470decc6 DK |
135 | } |
136 | ||
818d276c GS |
137 | JBUFFER_TRACE(descriptor, "submit commit block"); |
138 | lock_buffer(bh); | |
c4b8e635 | 139 | get_bh(bh); |
470decc6 | 140 | set_buffer_dirty(bh); |
818d276c GS |
141 | set_buffer_uptodate(bh); |
142 | bh->b_end_io = journal_end_buffer_io_sync; | |
143 | ||
144 | if (journal->j_flags & JBD2_BARRIER && | |
4d605179 | 145 | !JBD2_HAS_INCOMPAT_FEATURE(journal, |
818d276c | 146 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
470decc6 DK |
147 | set_buffer_ordered(bh); |
148 | barrier_done = 1; | |
149 | } | |
818d276c | 150 | ret = submit_bh(WRITE, bh); |
c4e35e07 DK |
151 | if (barrier_done) |
152 | clear_buffer_ordered(bh); | |
818d276c | 153 | |
470decc6 DK |
154 | /* is it possible for another commit to fail at roughly |
155 | * the same time as this one? If so, we don't want to | |
156 | * trust the barrier flag in the super, but instead want | |
157 | * to remember if we sent a barrier request | |
158 | */ | |
159 | if (ret == -EOPNOTSUPP && barrier_done) { | |
160 | char b[BDEVNAME_SIZE]; | |
161 | ||
162 | printk(KERN_WARNING | |
163 | "JBD: barrier-based sync failed on %s - " | |
164 | "disabling barriers\n", | |
165 | bdevname(journal->j_dev, b)); | |
166 | spin_lock(&journal->j_state_lock); | |
f7f4bccb | 167 | journal->j_flags &= ~JBD2_BARRIER; |
470decc6 DK |
168 | spin_unlock(&journal->j_state_lock); |
169 | ||
170 | /* And try again, without the barrier */ | |
470decc6 DK |
171 | set_buffer_uptodate(bh); |
172 | set_buffer_dirty(bh); | |
818d276c | 173 | ret = submit_bh(WRITE, bh); |
470decc6 | 174 | } |
818d276c GS |
175 | *cbh = bh; |
176 | return ret; | |
177 | } | |
178 | ||
179 | /* | |
180 | * This function along with journal_submit_commit_record | |
181 | * allows to write the commit record asynchronously. | |
182 | */ | |
183 | static int journal_wait_on_commit_record(struct buffer_head *bh) | |
184 | { | |
185 | int ret = 0; | |
186 | ||
187 | clear_buffer_dirty(bh); | |
188 | wait_on_buffer(bh); | |
470decc6 | 189 | |
818d276c GS |
190 | if (unlikely(!buffer_uptodate(bh))) |
191 | ret = -EIO; | |
192 | put_bh(bh); /* One for getblk() */ | |
193 | jbd2_journal_put_journal_head(bh2jh(bh)); | |
194 | ||
195 | return ret; | |
470decc6 DK |
196 | } |
197 | ||
818d276c GS |
198 | /* |
199 | * Wait for all submitted IO to complete. | |
200 | */ | |
201 | static int journal_wait_on_locked_list(journal_t *journal, | |
202 | transaction_t *commit_transaction) | |
203 | { | |
204 | int ret = 0; | |
205 | struct journal_head *jh; | |
206 | ||
207 | while (commit_transaction->t_locked_list) { | |
208 | struct buffer_head *bh; | |
209 | ||
210 | jh = commit_transaction->t_locked_list->b_tprev; | |
211 | bh = jh2bh(jh); | |
212 | get_bh(bh); | |
213 | if (buffer_locked(bh)) { | |
214 | spin_unlock(&journal->j_list_lock); | |
215 | wait_on_buffer(bh); | |
216 | if (unlikely(!buffer_uptodate(bh))) | |
217 | ret = -EIO; | |
218 | spin_lock(&journal->j_list_lock); | |
219 | } | |
220 | if (!inverted_lock(journal, bh)) { | |
221 | put_bh(bh); | |
222 | spin_lock(&journal->j_list_lock); | |
223 | continue; | |
224 | } | |
225 | if (buffer_jbd(bh) && jh->b_jlist == BJ_Locked) { | |
226 | __jbd2_journal_unfile_buffer(jh); | |
227 | jbd_unlock_bh_state(bh); | |
228 | jbd2_journal_remove_journal_head(bh); | |
229 | put_bh(bh); | |
230 | } else { | |
231 | jbd_unlock_bh_state(bh); | |
232 | } | |
233 | put_bh(bh); | |
234 | cond_resched_lock(&journal->j_list_lock); | |
235 | } | |
236 | return ret; | |
237 | } | |
238 | ||
470decc6 DK |
239 | static void journal_do_submit_data(struct buffer_head **wbuf, int bufs) |
240 | { | |
241 | int i; | |
242 | ||
243 | for (i = 0; i < bufs; i++) { | |
244 | wbuf[i]->b_end_io = end_buffer_write_sync; | |
245 | /* We use-up our safety reference in submit_bh() */ | |
246 | submit_bh(WRITE, wbuf[i]); | |
247 | } | |
248 | } | |
249 | ||
250 | /* | |
251 | * Submit all the data buffers to disk | |
252 | */ | |
253 | static void journal_submit_data_buffers(journal_t *journal, | |
254 | transaction_t *commit_transaction) | |
255 | { | |
256 | struct journal_head *jh; | |
257 | struct buffer_head *bh; | |
258 | int locked; | |
259 | int bufs = 0; | |
260 | struct buffer_head **wbuf = journal->j_wbuf; | |
261 | ||
262 | /* | |
263 | * Whenever we unlock the journal and sleep, things can get added | |
264 | * onto ->t_sync_datalist, so we have to keep looping back to | |
265 | * write_out_data until we *know* that the list is empty. | |
266 | * | |
267 | * Cleanup any flushed data buffers from the data list. Even in | |
268 | * abort mode, we want to flush this out as soon as possible. | |
269 | */ | |
270 | write_out_data: | |
271 | cond_resched(); | |
272 | spin_lock(&journal->j_list_lock); | |
273 | ||
274 | while (commit_transaction->t_sync_datalist) { | |
275 | jh = commit_transaction->t_sync_datalist; | |
276 | bh = jh2bh(jh); | |
277 | locked = 0; | |
278 | ||
279 | /* Get reference just to make sure buffer does not disappear | |
280 | * when we are forced to drop various locks */ | |
281 | get_bh(bh); | |
282 | /* If the buffer is dirty, we need to submit IO and hence | |
283 | * we need the buffer lock. We try to lock the buffer without | |
284 | * blocking. If we fail, we need to drop j_list_lock and do | |
285 | * blocking lock_buffer(). | |
286 | */ | |
287 | if (buffer_dirty(bh)) { | |
288 | if (test_set_buffer_locked(bh)) { | |
289 | BUFFER_TRACE(bh, "needs blocking lock"); | |
290 | spin_unlock(&journal->j_list_lock); | |
291 | /* Write out all data to prevent deadlocks */ | |
292 | journal_do_submit_data(wbuf, bufs); | |
293 | bufs = 0; | |
294 | lock_buffer(bh); | |
295 | spin_lock(&journal->j_list_lock); | |
296 | } | |
297 | locked = 1; | |
298 | } | |
299 | /* We have to get bh_state lock. Again out of order, sigh. */ | |
300 | if (!inverted_lock(journal, bh)) { | |
301 | jbd_lock_bh_state(bh); | |
302 | spin_lock(&journal->j_list_lock); | |
303 | } | |
304 | /* Someone already cleaned up the buffer? */ | |
305 | if (!buffer_jbd(bh) | |
306 | || jh->b_transaction != commit_transaction | |
307 | || jh->b_jlist != BJ_SyncData) { | |
308 | jbd_unlock_bh_state(bh); | |
309 | if (locked) | |
310 | unlock_buffer(bh); | |
311 | BUFFER_TRACE(bh, "already cleaned up"); | |
312 | put_bh(bh); | |
313 | continue; | |
314 | } | |
315 | if (locked && test_clear_buffer_dirty(bh)) { | |
316 | BUFFER_TRACE(bh, "needs writeout, adding to array"); | |
317 | wbuf[bufs++] = bh; | |
f7f4bccb | 318 | __jbd2_journal_file_buffer(jh, commit_transaction, |
470decc6 DK |
319 | BJ_Locked); |
320 | jbd_unlock_bh_state(bh); | |
321 | if (bufs == journal->j_wbufsize) { | |
322 | spin_unlock(&journal->j_list_lock); | |
323 | journal_do_submit_data(wbuf, bufs); | |
324 | bufs = 0; | |
325 | goto write_out_data; | |
326 | } | |
12603925 HH |
327 | } else if (!locked && buffer_locked(bh)) { |
328 | __jbd2_journal_file_buffer(jh, commit_transaction, | |
329 | BJ_Locked); | |
330 | jbd_unlock_bh_state(bh); | |
331 | put_bh(bh); | |
332 | } else { | |
470decc6 | 333 | BUFFER_TRACE(bh, "writeout complete: unfile"); |
f7f4bccb | 334 | __jbd2_journal_unfile_buffer(jh); |
470decc6 DK |
335 | jbd_unlock_bh_state(bh); |
336 | if (locked) | |
337 | unlock_buffer(bh); | |
f7f4bccb | 338 | jbd2_journal_remove_journal_head(bh); |
470decc6 | 339 | /* Once for our safety reference, once for |
f7f4bccb | 340 | * jbd2_journal_remove_journal_head() */ |
470decc6 DK |
341 | put_bh(bh); |
342 | put_bh(bh); | |
343 | } | |
344 | ||
95c354fe | 345 | if (need_resched() || spin_needbreak(&journal->j_list_lock)) { |
470decc6 DK |
346 | spin_unlock(&journal->j_list_lock); |
347 | goto write_out_data; | |
348 | } | |
349 | } | |
350 | spin_unlock(&journal->j_list_lock); | |
351 | journal_do_submit_data(wbuf, bufs); | |
352 | } | |
353 | ||
818d276c GS |
354 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
355 | { | |
356 | struct page *page = bh->b_page; | |
357 | char *addr; | |
358 | __u32 checksum; | |
359 | ||
360 | addr = kmap_atomic(page, KM_USER0); | |
361 | checksum = crc32_be(crc32_sum, | |
362 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); | |
363 | kunmap_atomic(addr, KM_USER0); | |
364 | ||
365 | return checksum; | |
366 | } | |
367 | ||
368 | static void write_tag_block(int tag_bytes, journal_block_tag_t *tag, | |
18eba7aa | 369 | unsigned long long block) |
b517bea1 ZB |
370 | { |
371 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); | |
cd02ff0b | 372 | if (tag_bytes > JBD2_TAG_SIZE32) |
b517bea1 ZB |
373 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
374 | } | |
375 | ||
470decc6 | 376 | /* |
f7f4bccb | 377 | * jbd2_journal_commit_transaction |
470decc6 DK |
378 | * |
379 | * The primary function for committing a transaction to the log. This | |
380 | * function is called by the journal thread to begin a complete commit. | |
381 | */ | |
f7f4bccb | 382 | void jbd2_journal_commit_transaction(journal_t *journal) |
470decc6 | 383 | { |
8e85fb3f | 384 | struct transaction_stats_s stats; |
470decc6 DK |
385 | transaction_t *commit_transaction; |
386 | struct journal_head *jh, *new_jh, *descriptor; | |
387 | struct buffer_head **wbuf = journal->j_wbuf; | |
388 | int bufs; | |
389 | int flags; | |
390 | int err; | |
18eba7aa | 391 | unsigned long long blocknr; |
470decc6 DK |
392 | char *tagp = NULL; |
393 | journal_header_t *header; | |
394 | journal_block_tag_t *tag = NULL; | |
395 | int space_left = 0; | |
396 | int first_tag = 0; | |
397 | int tag_flag; | |
398 | int i; | |
b517bea1 | 399 | int tag_bytes = journal_tag_bytes(journal); |
818d276c GS |
400 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
401 | __u32 crc32_sum = ~0; | |
470decc6 DK |
402 | |
403 | /* | |
404 | * First job: lock down the current transaction and wait for | |
405 | * all outstanding updates to complete. | |
406 | */ | |
407 | ||
408 | #ifdef COMMIT_STATS | |
409 | spin_lock(&journal->j_list_lock); | |
410 | summarise_journal_usage(journal); | |
411 | spin_unlock(&journal->j_list_lock); | |
412 | #endif | |
413 | ||
f7f4bccb MC |
414 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
415 | if (journal->j_flags & JBD2_FLUSHED) { | |
470decc6 | 416 | jbd_debug(3, "super block updated\n"); |
f7f4bccb | 417 | jbd2_journal_update_superblock(journal, 1); |
470decc6 DK |
418 | } else { |
419 | jbd_debug(3, "superblock not updated\n"); | |
420 | } | |
421 | ||
422 | J_ASSERT(journal->j_running_transaction != NULL); | |
423 | J_ASSERT(journal->j_committing_transaction == NULL); | |
424 | ||
425 | commit_transaction = journal->j_running_transaction; | |
426 | J_ASSERT(commit_transaction->t_state == T_RUNNING); | |
427 | ||
428 | jbd_debug(1, "JBD: starting commit of transaction %d\n", | |
429 | commit_transaction->t_tid); | |
430 | ||
431 | spin_lock(&journal->j_state_lock); | |
432 | commit_transaction->t_state = T_LOCKED; | |
433 | ||
8e85fb3f JL |
434 | stats.u.run.rs_wait = commit_transaction->t_max_wait; |
435 | stats.u.run.rs_locked = jiffies; | |
436 | stats.u.run.rs_running = jbd2_time_diff(commit_transaction->t_start, | |
437 | stats.u.run.rs_locked); | |
438 | ||
470decc6 DK |
439 | spin_lock(&commit_transaction->t_handle_lock); |
440 | while (commit_transaction->t_updates) { | |
441 | DEFINE_WAIT(wait); | |
442 | ||
443 | prepare_to_wait(&journal->j_wait_updates, &wait, | |
444 | TASK_UNINTERRUPTIBLE); | |
445 | if (commit_transaction->t_updates) { | |
446 | spin_unlock(&commit_transaction->t_handle_lock); | |
447 | spin_unlock(&journal->j_state_lock); | |
448 | schedule(); | |
449 | spin_lock(&journal->j_state_lock); | |
450 | spin_lock(&commit_transaction->t_handle_lock); | |
451 | } | |
452 | finish_wait(&journal->j_wait_updates, &wait); | |
453 | } | |
454 | spin_unlock(&commit_transaction->t_handle_lock); | |
455 | ||
456 | J_ASSERT (commit_transaction->t_outstanding_credits <= | |
457 | journal->j_max_transaction_buffers); | |
458 | ||
459 | /* | |
460 | * First thing we are allowed to do is to discard any remaining | |
461 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume | |
462 | * that there are no such buffers: if a large filesystem | |
463 | * operation like a truncate needs to split itself over multiple | |
f7f4bccb | 464 | * transactions, then it may try to do a jbd2_journal_restart() while |
470decc6 DK |
465 | * there are still BJ_Reserved buffers outstanding. These must |
466 | * be released cleanly from the current transaction. | |
467 | * | |
468 | * In this case, the filesystem must still reserve write access | |
469 | * again before modifying the buffer in the new transaction, but | |
470 | * we do not require it to remember exactly which old buffers it | |
471 | * has reserved. This is consistent with the existing behaviour | |
f7f4bccb | 472 | * that multiple jbd2_journal_get_write_access() calls to the same |
470decc6 DK |
473 | * buffer are perfectly permissable. |
474 | */ | |
475 | while (commit_transaction->t_reserved_list) { | |
476 | jh = commit_transaction->t_reserved_list; | |
477 | JBUFFER_TRACE(jh, "reserved, unused: refile"); | |
478 | /* | |
f7f4bccb | 479 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
470decc6 DK |
480 | * leave undo-committed data. |
481 | */ | |
482 | if (jh->b_committed_data) { | |
483 | struct buffer_head *bh = jh2bh(jh); | |
484 | ||
485 | jbd_lock_bh_state(bh); | |
af1e76d6 | 486 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
487 | jh->b_committed_data = NULL; |
488 | jbd_unlock_bh_state(bh); | |
489 | } | |
f7f4bccb | 490 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
491 | } |
492 | ||
493 | /* | |
494 | * Now try to drop any written-back buffers from the journal's | |
495 | * checkpoint lists. We do this *before* commit because it potentially | |
496 | * frees some memory | |
497 | */ | |
498 | spin_lock(&journal->j_list_lock); | |
f7f4bccb | 499 | __jbd2_journal_clean_checkpoint_list(journal); |
470decc6 DK |
500 | spin_unlock(&journal->j_list_lock); |
501 | ||
502 | jbd_debug (3, "JBD: commit phase 1\n"); | |
503 | ||
504 | /* | |
505 | * Switch to a new revoke table. | |
506 | */ | |
f7f4bccb | 507 | jbd2_journal_switch_revoke_table(journal); |
470decc6 | 508 | |
8e85fb3f JL |
509 | stats.u.run.rs_flushing = jiffies; |
510 | stats.u.run.rs_locked = jbd2_time_diff(stats.u.run.rs_locked, | |
511 | stats.u.run.rs_flushing); | |
512 | ||
470decc6 DK |
513 | commit_transaction->t_state = T_FLUSH; |
514 | journal->j_committing_transaction = commit_transaction; | |
515 | journal->j_running_transaction = NULL; | |
516 | commit_transaction->t_log_start = journal->j_head; | |
517 | wake_up(&journal->j_wait_transaction_locked); | |
518 | spin_unlock(&journal->j_state_lock); | |
519 | ||
520 | jbd_debug (3, "JBD: commit phase 2\n"); | |
521 | ||
470decc6 DK |
522 | /* |
523 | * Now start flushing things to disk, in the order they appear | |
524 | * on the transaction lists. Data blocks go first. | |
525 | */ | |
526 | err = 0; | |
527 | journal_submit_data_buffers(journal, commit_transaction); | |
528 | ||
529 | /* | |
818d276c GS |
530 | * Wait for all previously submitted IO to complete if commit |
531 | * record is to be written synchronously. | |
470decc6 DK |
532 | */ |
533 | spin_lock(&journal->j_list_lock); | |
818d276c GS |
534 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
535 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) | |
536 | err = journal_wait_on_locked_list(journal, | |
537 | commit_transaction); | |
470decc6 | 538 | |
470decc6 DK |
539 | spin_unlock(&journal->j_list_lock); |
540 | ||
541 | if (err) | |
a7fa2baf | 542 | jbd2_journal_abort(journal, err); |
470decc6 | 543 | |
f7f4bccb | 544 | jbd2_journal_write_revoke_records(journal, commit_transaction); |
470decc6 DK |
545 | |
546 | jbd_debug(3, "JBD: commit phase 2\n"); | |
547 | ||
548 | /* | |
549 | * If we found any dirty or locked buffers, then we should have | |
550 | * looped back up to the write_out_data label. If there weren't | |
551 | * any then journal_clean_data_list should have wiped the list | |
552 | * clean by now, so check that it is in fact empty. | |
553 | */ | |
554 | J_ASSERT (commit_transaction->t_sync_datalist == NULL); | |
555 | ||
556 | jbd_debug (3, "JBD: commit phase 3\n"); | |
557 | ||
558 | /* | |
559 | * Way to go: we have now written out all of the data for a | |
560 | * transaction! Now comes the tricky part: we need to write out | |
561 | * metadata. Loop over the transaction's entire buffer list: | |
562 | */ | |
563 | commit_transaction->t_state = T_COMMIT; | |
564 | ||
8e85fb3f JL |
565 | stats.u.run.rs_logging = jiffies; |
566 | stats.u.run.rs_flushing = jbd2_time_diff(stats.u.run.rs_flushing, | |
567 | stats.u.run.rs_logging); | |
568 | stats.u.run.rs_blocks = commit_transaction->t_outstanding_credits; | |
569 | stats.u.run.rs_blocks_logged = 0; | |
570 | ||
470decc6 DK |
571 | descriptor = NULL; |
572 | bufs = 0; | |
573 | while (commit_transaction->t_buffers) { | |
574 | ||
575 | /* Find the next buffer to be journaled... */ | |
576 | ||
577 | jh = commit_transaction->t_buffers; | |
578 | ||
579 | /* If we're in abort mode, we just un-journal the buffer and | |
580 | release it for background writing. */ | |
581 | ||
582 | if (is_journal_aborted(journal)) { | |
583 | JBUFFER_TRACE(jh, "journal is aborting: refile"); | |
f7f4bccb | 584 | jbd2_journal_refile_buffer(journal, jh); |
470decc6 DK |
585 | /* If that was the last one, we need to clean up |
586 | * any descriptor buffers which may have been | |
587 | * already allocated, even if we are now | |
588 | * aborting. */ | |
589 | if (!commit_transaction->t_buffers) | |
590 | goto start_journal_io; | |
591 | continue; | |
592 | } | |
593 | ||
594 | /* Make sure we have a descriptor block in which to | |
595 | record the metadata buffer. */ | |
596 | ||
597 | if (!descriptor) { | |
598 | struct buffer_head *bh; | |
599 | ||
600 | J_ASSERT (bufs == 0); | |
601 | ||
602 | jbd_debug(4, "JBD: get descriptor\n"); | |
603 | ||
f7f4bccb | 604 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
470decc6 | 605 | if (!descriptor) { |
a7fa2baf | 606 | jbd2_journal_abort(journal, -EIO); |
470decc6 DK |
607 | continue; |
608 | } | |
609 | ||
610 | bh = jh2bh(descriptor); | |
611 | jbd_debug(4, "JBD: got buffer %llu (%p)\n", | |
612 | (unsigned long long)bh->b_blocknr, bh->b_data); | |
613 | header = (journal_header_t *)&bh->b_data[0]; | |
f7f4bccb MC |
614 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
615 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); | |
470decc6 DK |
616 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
617 | ||
618 | tagp = &bh->b_data[sizeof(journal_header_t)]; | |
619 | space_left = bh->b_size - sizeof(journal_header_t); | |
620 | first_tag = 1; | |
621 | set_buffer_jwrite(bh); | |
622 | set_buffer_dirty(bh); | |
623 | wbuf[bufs++] = bh; | |
624 | ||
625 | /* Record it so that we can wait for IO | |
626 | completion later */ | |
627 | BUFFER_TRACE(bh, "ph3: file as descriptor"); | |
f7f4bccb | 628 | jbd2_journal_file_buffer(descriptor, commit_transaction, |
470decc6 DK |
629 | BJ_LogCtl); |
630 | } | |
631 | ||
632 | /* Where is the buffer to be written? */ | |
633 | ||
f7f4bccb | 634 | err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc6 DK |
635 | /* If the block mapping failed, just abandon the buffer |
636 | and repeat this loop: we'll fall into the | |
637 | refile-on-abort condition above. */ | |
638 | if (err) { | |
a7fa2baf | 639 | jbd2_journal_abort(journal, err); |
470decc6 DK |
640 | continue; |
641 | } | |
642 | ||
643 | /* | |
644 | * start_this_handle() uses t_outstanding_credits to determine | |
645 | * the free space in the log, but this counter is changed | |
f7f4bccb | 646 | * by jbd2_journal_next_log_block() also. |
470decc6 DK |
647 | */ |
648 | commit_transaction->t_outstanding_credits--; | |
649 | ||
650 | /* Bump b_count to prevent truncate from stumbling over | |
651 | the shadowed buffer! @@@ This can go if we ever get | |
652 | rid of the BJ_IO/BJ_Shadow pairing of buffers. */ | |
653 | atomic_inc(&jh2bh(jh)->b_count); | |
654 | ||
655 | /* Make a temporary IO buffer with which to write it out | |
656 | (this will requeue both the metadata buffer and the | |
657 | temporary IO buffer). new_bh goes on BJ_IO*/ | |
658 | ||
659 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); | |
660 | /* | |
f7f4bccb | 661 | * akpm: jbd2_journal_write_metadata_buffer() sets |
470decc6 DK |
662 | * new_bh->b_transaction to commit_transaction. |
663 | * We need to clean this up before we release new_bh | |
664 | * (which is of type BJ_IO) | |
665 | */ | |
666 | JBUFFER_TRACE(jh, "ph3: write metadata"); | |
f7f4bccb | 667 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
470decc6 DK |
668 | jh, &new_jh, blocknr); |
669 | set_bit(BH_JWrite, &jh2bh(new_jh)->b_state); | |
670 | wbuf[bufs++] = jh2bh(new_jh); | |
671 | ||
672 | /* Record the new block's tag in the current descriptor | |
673 | buffer */ | |
674 | ||
675 | tag_flag = 0; | |
676 | if (flags & 1) | |
f7f4bccb | 677 | tag_flag |= JBD2_FLAG_ESCAPE; |
470decc6 | 678 | if (!first_tag) |
f7f4bccb | 679 | tag_flag |= JBD2_FLAG_SAME_UUID; |
470decc6 DK |
680 | |
681 | tag = (journal_block_tag_t *) tagp; | |
b517bea1 | 682 | write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); |
470decc6 | 683 | tag->t_flags = cpu_to_be32(tag_flag); |
b517bea1 ZB |
684 | tagp += tag_bytes; |
685 | space_left -= tag_bytes; | |
470decc6 DK |
686 | |
687 | if (first_tag) { | |
688 | memcpy (tagp, journal->j_uuid, 16); | |
689 | tagp += 16; | |
690 | space_left -= 16; | |
691 | first_tag = 0; | |
692 | } | |
693 | ||
694 | /* If there's no more to do, or if the descriptor is full, | |
695 | let the IO rip! */ | |
696 | ||
697 | if (bufs == journal->j_wbufsize || | |
698 | commit_transaction->t_buffers == NULL || | |
b517bea1 | 699 | space_left < tag_bytes + 16) { |
470decc6 DK |
700 | |
701 | jbd_debug(4, "JBD: Submit %d IOs\n", bufs); | |
702 | ||
703 | /* Write an end-of-descriptor marker before | |
704 | submitting the IOs. "tag" still points to | |
705 | the last tag we set up. */ | |
706 | ||
f7f4bccb | 707 | tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG); |
470decc6 DK |
708 | |
709 | start_journal_io: | |
710 | for (i = 0; i < bufs; i++) { | |
711 | struct buffer_head *bh = wbuf[i]; | |
818d276c GS |
712 | /* |
713 | * Compute checksum. | |
714 | */ | |
715 | if (JBD2_HAS_COMPAT_FEATURE(journal, | |
716 | JBD2_FEATURE_COMPAT_CHECKSUM)) { | |
717 | crc32_sum = | |
718 | jbd2_checksum_data(crc32_sum, bh); | |
719 | } | |
720 | ||
470decc6 DK |
721 | lock_buffer(bh); |
722 | clear_buffer_dirty(bh); | |
723 | set_buffer_uptodate(bh); | |
724 | bh->b_end_io = journal_end_buffer_io_sync; | |
725 | submit_bh(WRITE, bh); | |
726 | } | |
727 | cond_resched(); | |
8e85fb3f | 728 | stats.u.run.rs_blocks_logged += bufs; |
470decc6 DK |
729 | |
730 | /* Force a new descriptor to be generated next | |
731 | time round the loop. */ | |
732 | descriptor = NULL; | |
733 | bufs = 0; | |
734 | } | |
735 | } | |
736 | ||
818d276c GS |
737 | /* Done it all: now write the commit record asynchronously. */ |
738 | ||
739 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, | |
740 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { | |
741 | err = journal_submit_commit_record(journal, commit_transaction, | |
742 | &cbh, crc32_sum); | |
743 | if (err) | |
744 | __jbd2_journal_abort_hard(journal); | |
745 | ||
746 | spin_lock(&journal->j_list_lock); | |
747 | err = journal_wait_on_locked_list(journal, | |
748 | commit_transaction); | |
749 | spin_unlock(&journal->j_list_lock); | |
750 | if (err) | |
751 | __jbd2_journal_abort_hard(journal); | |
752 | } | |
753 | ||
470decc6 DK |
754 | /* Lo and behold: we have just managed to send a transaction to |
755 | the log. Before we can commit it, wait for the IO so far to | |
756 | complete. Control buffers being written are on the | |
757 | transaction's t_log_list queue, and metadata buffers are on | |
758 | the t_iobuf_list queue. | |
759 | ||
760 | Wait for the buffers in reverse order. That way we are | |
761 | less likely to be woken up until all IOs have completed, and | |
762 | so we incur less scheduling load. | |
763 | */ | |
764 | ||
765 | jbd_debug(3, "JBD: commit phase 4\n"); | |
766 | ||
767 | /* | |
768 | * akpm: these are BJ_IO, and j_list_lock is not needed. | |
769 | * See __journal_try_to_free_buffer. | |
770 | */ | |
771 | wait_for_iobuf: | |
772 | while (commit_transaction->t_iobuf_list != NULL) { | |
773 | struct buffer_head *bh; | |
774 | ||
775 | jh = commit_transaction->t_iobuf_list->b_tprev; | |
776 | bh = jh2bh(jh); | |
777 | if (buffer_locked(bh)) { | |
778 | wait_on_buffer(bh); | |
779 | goto wait_for_iobuf; | |
780 | } | |
781 | if (cond_resched()) | |
782 | goto wait_for_iobuf; | |
783 | ||
784 | if (unlikely(!buffer_uptodate(bh))) | |
785 | err = -EIO; | |
786 | ||
787 | clear_buffer_jwrite(bh); | |
788 | ||
789 | JBUFFER_TRACE(jh, "ph4: unfile after journal write"); | |
f7f4bccb | 790 | jbd2_journal_unfile_buffer(journal, jh); |
470decc6 DK |
791 | |
792 | /* | |
793 | * ->t_iobuf_list should contain only dummy buffer_heads | |
f7f4bccb | 794 | * which were created by jbd2_journal_write_metadata_buffer(). |
470decc6 DK |
795 | */ |
796 | BUFFER_TRACE(bh, "dumping temporary bh"); | |
f7f4bccb | 797 | jbd2_journal_put_journal_head(jh); |
470decc6 DK |
798 | __brelse(bh); |
799 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); | |
800 | free_buffer_head(bh); | |
801 | ||
802 | /* We also have to unlock and free the corresponding | |
803 | shadowed buffer */ | |
804 | jh = commit_transaction->t_shadow_list->b_tprev; | |
805 | bh = jh2bh(jh); | |
806 | clear_bit(BH_JWrite, &bh->b_state); | |
807 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); | |
808 | ||
809 | /* The metadata is now released for reuse, but we need | |
810 | to remember it against this transaction so that when | |
811 | we finally commit, we can do any checkpointing | |
812 | required. */ | |
813 | JBUFFER_TRACE(jh, "file as BJ_Forget"); | |
f7f4bccb | 814 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
470decc6 DK |
815 | /* Wake up any transactions which were waiting for this |
816 | IO to complete */ | |
817 | wake_up_bit(&bh->b_state, BH_Unshadow); | |
818 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); | |
819 | __brelse(bh); | |
820 | } | |
821 | ||
822 | J_ASSERT (commit_transaction->t_shadow_list == NULL); | |
823 | ||
824 | jbd_debug(3, "JBD: commit phase 5\n"); | |
825 | ||
826 | /* Here we wait for the revoke record and descriptor record buffers */ | |
827 | wait_for_ctlbuf: | |
828 | while (commit_transaction->t_log_list != NULL) { | |
829 | struct buffer_head *bh; | |
830 | ||
831 | jh = commit_transaction->t_log_list->b_tprev; | |
832 | bh = jh2bh(jh); | |
833 | if (buffer_locked(bh)) { | |
834 | wait_on_buffer(bh); | |
835 | goto wait_for_ctlbuf; | |
836 | } | |
837 | if (cond_resched()) | |
838 | goto wait_for_ctlbuf; | |
839 | ||
840 | if (unlikely(!buffer_uptodate(bh))) | |
841 | err = -EIO; | |
842 | ||
843 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); | |
844 | clear_buffer_jwrite(bh); | |
f7f4bccb MC |
845 | jbd2_journal_unfile_buffer(journal, jh); |
846 | jbd2_journal_put_journal_head(jh); | |
470decc6 DK |
847 | __brelse(bh); /* One for getblk */ |
848 | /* AKPM: bforget here */ | |
849 | } | |
850 | ||
851 | jbd_debug(3, "JBD: commit phase 6\n"); | |
852 | ||
818d276c GS |
853 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
854 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { | |
855 | err = journal_submit_commit_record(journal, commit_transaction, | |
856 | &cbh, crc32_sum); | |
857 | if (err) | |
858 | __jbd2_journal_abort_hard(journal); | |
859 | } | |
b048d846 MC |
860 | if (!err && !is_journal_aborted(journal)) |
861 | err = journal_wait_on_commit_record(cbh); | |
470decc6 DK |
862 | |
863 | if (err) | |
a7fa2baf | 864 | jbd2_journal_abort(journal, err); |
470decc6 DK |
865 | |
866 | /* End of a transaction! Finally, we can do checkpoint | |
867 | processing: any buffers committed as a result of this | |
868 | transaction can be removed from any checkpoint list it was on | |
869 | before. */ | |
870 | ||
871 | jbd_debug(3, "JBD: commit phase 7\n"); | |
872 | ||
873 | J_ASSERT(commit_transaction->t_sync_datalist == NULL); | |
874 | J_ASSERT(commit_transaction->t_buffers == NULL); | |
875 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); | |
876 | J_ASSERT(commit_transaction->t_iobuf_list == NULL); | |
877 | J_ASSERT(commit_transaction->t_shadow_list == NULL); | |
878 | J_ASSERT(commit_transaction->t_log_list == NULL); | |
879 | ||
880 | restart_loop: | |
881 | /* | |
882 | * As there are other places (journal_unmap_buffer()) adding buffers | |
883 | * to this list we have to be careful and hold the j_list_lock. | |
884 | */ | |
885 | spin_lock(&journal->j_list_lock); | |
886 | while (commit_transaction->t_forget) { | |
887 | transaction_t *cp_transaction; | |
888 | struct buffer_head *bh; | |
889 | ||
890 | jh = commit_transaction->t_forget; | |
891 | spin_unlock(&journal->j_list_lock); | |
892 | bh = jh2bh(jh); | |
893 | jbd_lock_bh_state(bh); | |
894 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction || | |
895 | jh->b_transaction == journal->j_running_transaction); | |
896 | ||
897 | /* | |
898 | * If there is undo-protected committed data against | |
899 | * this buffer, then we can remove it now. If it is a | |
900 | * buffer needing such protection, the old frozen_data | |
901 | * field now points to a committed version of the | |
902 | * buffer, so rotate that field to the new committed | |
903 | * data. | |
904 | * | |
905 | * Otherwise, we can just throw away the frozen data now. | |
906 | */ | |
907 | if (jh->b_committed_data) { | |
af1e76d6 | 908 | jbd2_free(jh->b_committed_data, bh->b_size); |
470decc6 DK |
909 | jh->b_committed_data = NULL; |
910 | if (jh->b_frozen_data) { | |
911 | jh->b_committed_data = jh->b_frozen_data; | |
912 | jh->b_frozen_data = NULL; | |
913 | } | |
914 | } else if (jh->b_frozen_data) { | |
af1e76d6 | 915 | jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc6 DK |
916 | jh->b_frozen_data = NULL; |
917 | } | |
918 | ||
919 | spin_lock(&journal->j_list_lock); | |
920 | cp_transaction = jh->b_cp_transaction; | |
921 | if (cp_transaction) { | |
922 | JBUFFER_TRACE(jh, "remove from old cp transaction"); | |
8e85fb3f | 923 | cp_transaction->t_chp_stats.cs_dropped++; |
f7f4bccb | 924 | __jbd2_journal_remove_checkpoint(jh); |
470decc6 DK |
925 | } |
926 | ||
927 | /* Only re-checkpoint the buffer_head if it is marked | |
928 | * dirty. If the buffer was added to the BJ_Forget list | |
f7f4bccb | 929 | * by jbd2_journal_forget, it may no longer be dirty and |
470decc6 DK |
930 | * there's no point in keeping a checkpoint record for |
931 | * it. */ | |
932 | ||
933 | /* A buffer which has been freed while still being | |
934 | * journaled by a previous transaction may end up still | |
935 | * being dirty here, but we want to avoid writing back | |
936 | * that buffer in the future now that the last use has | |
937 | * been committed. That's not only a performance gain, | |
938 | * it also stops aliasing problems if the buffer is left | |
939 | * behind for writeback and gets reallocated for another | |
940 | * use in a different page. */ | |
941 | if (buffer_freed(bh)) { | |
942 | clear_buffer_freed(bh); | |
943 | clear_buffer_jbddirty(bh); | |
944 | } | |
945 | ||
946 | if (buffer_jbddirty(bh)) { | |
947 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); | |
f7f4bccb | 948 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
470decc6 | 949 | JBUFFER_TRACE(jh, "refile for checkpoint writeback"); |
f7f4bccb | 950 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
951 | jbd_unlock_bh_state(bh); |
952 | } else { | |
953 | J_ASSERT_BH(bh, !buffer_dirty(bh)); | |
954 | /* The buffer on BJ_Forget list and not jbddirty means | |
955 | * it has been freed by this transaction and hence it | |
956 | * could not have been reallocated until this | |
957 | * transaction has committed. *BUT* it could be | |
958 | * reallocated once we have written all the data to | |
959 | * disk and before we process the buffer on BJ_Forget | |
960 | * list. */ | |
961 | JBUFFER_TRACE(jh, "refile or unfile freed buffer"); | |
f7f4bccb | 962 | __jbd2_journal_refile_buffer(jh); |
470decc6 DK |
963 | if (!jh->b_transaction) { |
964 | jbd_unlock_bh_state(bh); | |
965 | /* needs a brelse */ | |
f7f4bccb | 966 | jbd2_journal_remove_journal_head(bh); |
470decc6 DK |
967 | release_buffer_page(bh); |
968 | } else | |
969 | jbd_unlock_bh_state(bh); | |
970 | } | |
971 | cond_resched_lock(&journal->j_list_lock); | |
972 | } | |
973 | spin_unlock(&journal->j_list_lock); | |
974 | /* | |
f5a7a6b0 JK |
975 | * This is a bit sleazy. We use j_list_lock to protect transition |
976 | * of a transaction into T_FINISHED state and calling | |
977 | * __jbd2_journal_drop_transaction(). Otherwise we could race with | |
978 | * other checkpointing code processing the transaction... | |
470decc6 DK |
979 | */ |
980 | spin_lock(&journal->j_state_lock); | |
981 | spin_lock(&journal->j_list_lock); | |
982 | /* | |
983 | * Now recheck if some buffers did not get attached to the transaction | |
984 | * while the lock was dropped... | |
985 | */ | |
986 | if (commit_transaction->t_forget) { | |
987 | spin_unlock(&journal->j_list_lock); | |
988 | spin_unlock(&journal->j_state_lock); | |
989 | goto restart_loop; | |
990 | } | |
991 | ||
992 | /* Done with this transaction! */ | |
993 | ||
994 | jbd_debug(3, "JBD: commit phase 8\n"); | |
995 | ||
996 | J_ASSERT(commit_transaction->t_state == T_COMMIT); | |
997 | ||
8e85fb3f JL |
998 | commit_transaction->t_start = jiffies; |
999 | stats.u.run.rs_logging = jbd2_time_diff(stats.u.run.rs_logging, | |
1000 | commit_transaction->t_start); | |
1001 | ||
1002 | /* | |
1003 | * File the transaction for history | |
1004 | */ | |
1005 | stats.ts_type = JBD2_STATS_RUN; | |
1006 | stats.ts_tid = commit_transaction->t_tid; | |
1007 | stats.u.run.rs_handle_count = commit_transaction->t_handle_count; | |
1008 | spin_lock(&journal->j_history_lock); | |
1009 | memcpy(journal->j_history + journal->j_history_cur, &stats, | |
1010 | sizeof(stats)); | |
1011 | if (++journal->j_history_cur == journal->j_history_max) | |
1012 | journal->j_history_cur = 0; | |
1013 | ||
1014 | /* | |
1015 | * Calculate overall stats | |
1016 | */ | |
1017 | journal->j_stats.ts_tid++; | |
1018 | journal->j_stats.u.run.rs_wait += stats.u.run.rs_wait; | |
1019 | journal->j_stats.u.run.rs_running += stats.u.run.rs_running; | |
1020 | journal->j_stats.u.run.rs_locked += stats.u.run.rs_locked; | |
1021 | journal->j_stats.u.run.rs_flushing += stats.u.run.rs_flushing; | |
1022 | journal->j_stats.u.run.rs_logging += stats.u.run.rs_logging; | |
1023 | journal->j_stats.u.run.rs_handle_count += stats.u.run.rs_handle_count; | |
1024 | journal->j_stats.u.run.rs_blocks += stats.u.run.rs_blocks; | |
1025 | journal->j_stats.u.run.rs_blocks_logged += stats.u.run.rs_blocks_logged; | |
1026 | spin_unlock(&journal->j_history_lock); | |
1027 | ||
470decc6 DK |
1028 | commit_transaction->t_state = T_FINISHED; |
1029 | J_ASSERT(commit_transaction == journal->j_committing_transaction); | |
1030 | journal->j_commit_sequence = commit_transaction->t_tid; | |
1031 | journal->j_committing_transaction = NULL; | |
1032 | spin_unlock(&journal->j_state_lock); | |
1033 | ||
f89b7795 JK |
1034 | if (commit_transaction->t_checkpoint_list == NULL && |
1035 | commit_transaction->t_checkpoint_io_list == NULL) { | |
f7f4bccb | 1036 | __jbd2_journal_drop_transaction(journal, commit_transaction); |
470decc6 DK |
1037 | } else { |
1038 | if (journal->j_checkpoint_transactions == NULL) { | |
1039 | journal->j_checkpoint_transactions = commit_transaction; | |
1040 | commit_transaction->t_cpnext = commit_transaction; | |
1041 | commit_transaction->t_cpprev = commit_transaction; | |
1042 | } else { | |
1043 | commit_transaction->t_cpnext = | |
1044 | journal->j_checkpoint_transactions; | |
1045 | commit_transaction->t_cpprev = | |
1046 | commit_transaction->t_cpnext->t_cpprev; | |
1047 | commit_transaction->t_cpnext->t_cpprev = | |
1048 | commit_transaction; | |
1049 | commit_transaction->t_cpprev->t_cpnext = | |
1050 | commit_transaction; | |
1051 | } | |
1052 | } | |
1053 | spin_unlock(&journal->j_list_lock); | |
1054 | ||
1055 | jbd_debug(1, "JBD: commit %d complete, head %d\n", | |
1056 | journal->j_commit_sequence, journal->j_tail_sequence); | |
1057 | ||
1058 | wake_up(&journal->j_wait_done_commit); | |
1059 | } |